Example #1
0
// limitRequestRatioConstraint enforces the limit to request ratio over the specified resource
func limitRequestRatioConstraint(limitType api.LimitType, resourceName api.ResourceName, enforced resource.Quantity, request api.ResourceList, limit api.ResourceList) error {
	req, reqExists := request[resourceName]
	lim, limExists := limit[resourceName]
	observedReqValue, observedLimValue, _ := requestLimitEnforcedValues(req, lim, enforced)

	if !reqExists || (observedReqValue == int64(0)) {
		return fmt.Errorf("%s max limit to request ratio per %s is %s, but no request is specified or request is 0.", resourceName, limitType, enforced.String())
	}
	if !limExists || (observedLimValue == int64(0)) {
		return fmt.Errorf("%s max limit to request ratio per %s is %s, but no limit is specified or limit is 0.", resourceName, limitType, enforced.String())
	}

	observedRatio := float64(observedLimValue) / float64(observedReqValue)
	displayObservedRatio := observedRatio
	maxLimitRequestRatio := float64(enforced.Value())
	if enforced.Value() <= resource.MaxMilliValue {
		observedRatio = observedRatio * 1000
		maxLimitRequestRatio = float64(enforced.MilliValue())
	}

	if observedRatio > maxLimitRequestRatio {
		return fmt.Errorf("%s max limit to request ratio per %s is %s, but provided ratio is %f.", resourceName, limitType, enforced.String(), displayObservedRatio)
	}

	return nil
}
Example #2
0
// requestLimitEnforcedValues returns the specified values at a common precision to support comparability
func requestLimitEnforcedValues(requestQuantity, limitQuantity, enforcedQuantity resource.Quantity) (request, limit, enforced int64) {
	request = requestQuantity.Value()
	limit = limitQuantity.Value()
	enforced = enforcedQuantity.Value()
	// do a more precise comparison if possible (if the value won't overflow)
	if request <= resource.MaxMilliValue && limit <= resource.MaxMilliValue && enforced <= resource.MaxMilliValue {
		request = requestQuantity.MilliValue()
		limit = limitQuantity.MilliValue()
		enforced = enforcedQuantity.MilliValue()
	}
	return
}